[Discuss-gnuradio] Re: problem with USRP/FFT sink in GRC

[Josh Blum]

I too am having an issue with GRC or gnu radio...

You see, version 0.60 could not transmit on side B because I was doing this: u.tune(0, subdev, freq), but the txrx could receive on side B.

In version 0.65 I switched the code to 
u.tune(subdev._which, subdev, freq). Now the A/B transmit works. Just today, I discovered that the tvrx on side B will send out "peculiar" signals until I change the subdev._which back to zero.

So I am not sure if this is a bug, a feature, or If am tuning this wrong. I am using USRP rev3 and month-recent version of the trunk.

How do I tune the USRP for receiving on side A?
How do I tune the USRP for receiving on side B?
How do I tune the USRP for transmitting on side A?
How do I tune the USRP for transmitting on side B?

-Josh

On 4/27/07, Anastasopoulos Achilleas <address@hidden > wrote:

Hi,

I am running a simple graph in GRC-0.65 with complex USRP as source
(with TVRX at the B side) and a complex FFT as a sink.
What I see is not expected: I see the FFT of a real signal
(symmetric around 0).

When I run the python example usrp_fft.py I get
the expected result.
./usrp_fft.py -RB -f 93.1e6 -d 16

I attach the grc graph for anyone who wants to take a look at it
and give me some hint as to what I might be doing wrong.

Thanks
Achilleas